Chapter 8.11, Problem 8.20CP

The “sales[][]” array contains “24” elements.

Program Plan Intro

Two-dimensional array:

A two dimensional array is also called as a multi-dimensional array; a multidimensional array is that all the identical arrays are put together into a single array.

• This is useful for storing same type of multiple sets of data in same place.
• The main advantage is that one-dimensional array can hold only one set of value whereas two-dimensional array can hold multiple sets of data in the form of rows and columns.
• The structure of a multi-dimensional array is lookalike a table (that is combination of rows and columns); it contains same type of columns.
• The number of elements of an array can be calculated by multiplying the number of rows and number of columns of the array.

Example:

//Declaring multi-dimensional array

double testmarks[5][5];

The above statement is used to create a multidimensional array with “5” rows and “5” columns; the first subscript (that is square bracket) is used to refer the number of rows and the second subscript is used to refer the number of columns.

• The data type “double” represents that the array will hold only “double” type of data.
• The “testmarks” array can hold 25 elements (that is $5\times 5=25$).